Avid officially ended support for Media Composer 6.x in late 2015. You cannot buy a new activation pack directly from Avid’s online store. However, "end-of-support" does not mean "end-of-license." Here are the legal methods to obtain one:
If the editing workstation lacks internet access, you must generate a license file: Avid media composer 6.5.2 activation pack
You're looking for information on Avid Media Composer 6.5.2 and its activation pack. Here are some details: Avid officially ended support for Media Composer 6
To activate Avid Media Composer 6.5.2 , you primarily use the Avid License Control tool (the predecessor to modern Avid Link) or a physical USB Dongle Avid media composer 6.5.2 activation pack